Update koa-views requirement from 6.1.4 to 6.1.5 (#3979)
Update koa-views requirement from 6.1.4 to 6.1.5 (#3979)

Updates the requirements on [koa-views](https://github.com/queckezz/koa-views) to permit the latest version.
- [Release notes](https://github.com/queckezz/koa-views/releases)
- [Changelog](https://github.com/queckezz/koa-views/blob/master/history.md)
- [Commits](https://github.com/queckezz/koa-views/commits/v6.1.5)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
syuilo/Misskey,syuilo/Misskey